I cloroplasti svolgono la fotosintesi clorofialiana ; nei mitocondri, invece, avviene la respirazione cellullare.

I batteri sono cellule procariote; queste cellule sono prive di membrana cellulare e possono vivere anche negli ambienti più estremi.

La parte fluida del citoplasma, il citosol, è una soluzione di ioni, piccole molecole e grosse proteine; nelle cellule eucariote metà del citoplasma è costituito da piccole strutture chiamate organuli.

Tutte le cellule sono rivestite da una membrana cellulare, formata da un doppio strato fosfolipidico; le cellule vegetali hanno anche una parete rigida costituita da cellulosa.

Le cellule Eucariote: hanno dimensioni limitate per favorire il rapporto superficie/volume e rendere le cellule metabolicamente attive.

Il nucleo, avvolto da una doppia membrana dotata di pori per poter comunicare col citoplasma, contiene il DNA sotto forma di cromatina e un nucleolo che assembla i ribosomi.

Il citoscheletro mantiene la forma della cellula, fissa gli organuli, dirige il traffico interno e le consente di muoversi; è formato da filamenti di actina, microtubuli e filamenti intermedi.

Ciglia e flagelli sono formati da filamenti proteici; servono per il movimento.

Il vacuolo è una cavità citoplasmatica contenente acqua e soluti, delimitata da una membrana; le vescicole con funzione di trasporto, sono piccole e hanno una struttura uguale al vacuolo

Il reticolo endoplasmatico è costituito da un sistema di membrane; il reticolo rugoso ricoperto di ribosomi da ribosomi sintetizza le proteine e il reticolo liscio sintetizza soppratutto lipidi.

I lisosomi sono vescicole che racchiudono gli enzimi coinvolti nelle reazioni di idrolisi, i proteasomi sono specializzati nel demolire proteine per riciclare amminoacidi, i perossisomi contengono diversi enzimi ossidativi.

I ribosomi sono sono siti presso cui vengono assemblati gli amminoacidi per la sintesi delle proteine.

L'apparato di golgi è un centro di elaborazione di molecole complesse che vengono poi avvolte in vescicole e trattenute nella cellula stessa o esportate.

When you take your attention into the present moment, a certain alertness arises. You become more conscious of what's around you, but also, strangely, a sense of presence that is both within and without.

It's a tragedy, in a way, that Americans are brought up to think that they cannot feel for other people and other beings just because they are different. They think they're different. It's very limiting.

I grew up in southern California in the '80s. Yes, I am a walking cliche.

Just because a stock is down doesn't mean it's a great buy.

Defense is a definite part of the game and a great part of defense is learning to play it without fouling.

It's happening right now... it's just not on film, it's not being recorded.

To be honest dinner conversations was the worst bit about being a child and listening to the boring people around me.

Television audiences are ruthless - look what happened to 'The Killing.'

I totally disagree with the view that the Tibet struggle will die, and there will be no hope for Tibet, after the Dalai Lama passes away.

There are some people who, if they don't already know, you can't tell 'em.

A true knight is fuller of bravery in the midst, than in the beginning of danger.

My mom has never been a big meddler and isn't, like, extremely opinionated or at least just doesn't voice it to me. She's sort of let me come into my own by myself, and I think that's just a testament to what my parents did in terms of raising us.

Don't worry about failure; you only have to be right once.

Well, I'm a Catholic by birth and you can never shed it.

Every day is a blessing.

We are born free, but we're taught to obey orders.

Who knew we had all this O.C.D. in the world? Well actually, I suppose it's pretty obvious. It explains Sudoku, doesn't it?

The future battle on the ground will be preceded by battle in the air. This will determine which of the contestants has to suffer operational and tactical disadvantages and be forced throughout the battle into adoption compromise solutions.

When governments run on petro dollars or petro revenue instead of taxes, then they kind of sever the link between taxation and representation, and if you're not being taxed, then you're not being represented.

His work isn't all glower. Even though he hasn't smiled in a movie since the underrated 'Proof' in the early 1990s, Mr. Crowe is given to a hurt swallow when he's uncomfortable and to a look of suffering in his eyes.

I was the illegitimate child of the legitimate theater. I had no training. I came from downtown rock and roll, and when I came in and auditioned for the Broadway revival of 'Hair,' I had no eyebrows - kind of a Bowie-esque glimmer kid. And it was hard representing the flower power era when we were stone cold punks.

Country music is just country. It's going to shift around a little bit, doing some different instrumentations, different production styles. But it will always come back to what you heard at the Opry. Nobody wants it to change.

It doesn't make sense for me to be a lawyer in a place where there is no law.

My torso is short, but my arms are really long and gangly and my legs and my neck, and my feet and hands are really long, and I look like a duck.